This dash-mounted control knob lets the driver adjust ignition timing up to 15 degrees from the driver's seat to compensate for changes in altitude, low octane gas, or heavy loads. It's ideal for cars driven daily but raced occasionally on weekends, and can improve fuel mileage and performance by advancing or retarding timing to help prevent detonation.Specifications: Type: Adjustable Timing Control Adjustment Range: Up to 15° Compatible Cylinder Counts: 4, 6, and 8-cylinder engines Requires: MSD Ignition Control Warranty: Manufacturer's Limited 1 Year Warranty Part Number: 8680 Not for nitrous use. Must be used with an MSD Ignition Control.FAQWhat is the MSD 8680 adjustable timing control used for?It's a dash-mounted control knob that lets the driver adjust ignition timing up to 15 degrees from the driver's seat.Can the MSD 8680 be used with nitrous?No, it is not for nitrous use.What does the MSD 8680 require to function?It must be used with an MSD Ignition Control and works on 4, 6, or 8-cylinder engines.{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is the MSD 8680 adjustable timing control used for?","acceptedAnswer":{"@type":"Answer","text":"It's a dash-mounted control knob that lets the driver adjust ignition timing up to 15 degrees from the driver's seat."}},{"@type":"Question","name":"Can the MSD 8680 be used with nitrous?","acceptedAnswer":{"@type":"Answer","text":"No, it is not for nitrous use."}},{"@type":"Question","name":"What does the MSD 8680 require to function?","acceptedAnswer":{"@type":"Answer","text":"It must be used with an MSD Ignition Control and works on 4, 6, or 8-cylinder engines."}}]}